191992582261 has 8 divisors (see below), whose sum is σ = 194849978400. Its totient is φ = 189156274320.

The previous prime is 191992582213. The next prime is 191992582277. The reversal of 191992582261 is 162285299191.

It is a happy number.

191992582261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191992582261 - 2⁹ = 191992581749 is a prime.

It is a super-2 number, since 2×191992582261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191992582211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5253706 + ... + 5290123.

It is an arithmetic number, because the mean of its divisors is an integer number (24356247300).

Almost surely, 2^191992582261 is an apocalyptic number.

It is an amenable number.

191992582261 is a deficient number, since it is larger than the sum of its proper divisors (2857396139).

191992582261 is a wasteful number, since it uses less digits than its factorization.

191992582261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544099.

The product of its digits is 1399680, while the sum is 55.

The spelling of 191992582261 in words is "one hundred ninety-one billion, nine hundred ninety-two million, five hundred eighty-two thousand, two hundred sixty-one".